/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_trans_priv.h"
#include "xfs_inode_item.h"
#include "xfs_trace.h"

#ifdef XFS_TRANS_DEBUG
STATIC void
xfs_trans_inode_broot_debug(
        xfs_inode_t     *ip);
#else
#define xfs_trans_inode_broot_debug(ip)
#endif

/*
 * Get an inode and join it to the transaction.
 */
int
xfs_trans_iget(
        xfs_mount_t     *mp,
        xfs_trans_t     *tp,
        xfs_ino_t       ino,
        uint            flags,
        uint            lock_flags,
        xfs_inode_t     **ipp)
{
        int                     error;

        error = xfs_iget(mp, tp, ino, flags, lock_flags, ipp);
        if (!error && tp) {
                xfs_trans_ijoin(tp, *ipp);
                (*ipp)->i_itemp->ili_lock_flags = lock_flags;
        }
        return error;
}

/*
 * Add a locked inode to the transaction.
 *
 * The inode must be locked, and it cannot be associated with any transaction.
 */
void
xfs_trans_ijoin(
        struct xfs_trans        *tp,
        struct xfs_inode        *ip)
{
        xfs_inode_log_item_t    *iip;

        ASSERT(ip->i_transp == NULL);
        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
        if (ip->i_itemp == NULL)
                xfs_inode_item_init(ip, ip->i_mount);
        iip = ip->i_itemp;
        ASSERT(iip->ili_lock_flags == 0);

        /*
         * Get a log_item_desc to point at the new item.
         */
        xfs_trans_add_item(tp, &iip->ili_item);

        xfs_trans_inode_broot_debug(ip);

        /*
         * Initialize i_transp so we can find it with xfs_inode_incore()
         * in xfs_trans_iget() above.
         */
        ip->i_transp = tp;
}

/*
 * Add a locked inode to the transaction.
 *
 *
 * Grabs a reference to the inode which will be dropped when the transaction
 * is commited.  The inode will also be unlocked at that point.  The inode
 * must be locked, and it cannot be associated with any transaction.
 */
void
xfs_trans_ijoin_ref(
        struct xfs_trans        *tp,
        struct xfs_inode        *ip,
        uint                    lock_flags)
{
        xfs_trans_ijoin(tp, ip);
        IHOLD(ip);
        ip->i_itemp->ili_lock_flags = lock_flags;
}

/*
 * Transactional inode timestamp update. Requires the inode to be locked and
 * joined to the transaction supplied. Relies on the transaction subsystem to
 * track dirty state and update/writeback the inode accordingly.
 */
void
xfs_trans_ichgtime(
        struct xfs_trans        *tp,
        struct xfs_inode        *ip,
        int                     flags)
{
        struct inode            *inode = VFS_I(ip);
        timespec_t              tv;

        ASSERT(tp);
        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
        ASSERT(ip->i_transp == tp);

        tv = current_fs_time(inode->i_sb);

        if ((flags & XFS_ICHGTIME_MOD) &&
            !timespec_equal(&inode->i_mtime, &tv)) {
                inode->i_mtime = tv;
        }
        if ((flags & XFS_ICHGTIME_CHG) &&
            !timespec_equal(&inode->i_ctime, &tv)) {
                inode->i_ctime = tv;
        }
}

/*
 * This is called to mark the fields indicated in fieldmask as needing
 * to be logged when the transaction is committed.  The inode must
 * already be associated with the given transaction.
 *
 * The values for fieldmask are defined in xfs_inode_item.h.  We always
 * log all of the core inode if any of it has changed, and we always log
 * all of the inline data/extents/b-tree root if any of them has changed.
 */
void
xfs_trans_log_inode(
        xfs_trans_t     *tp,
        xfs_inode_t     *ip,
        uint            flags)
{
        ASSERT(ip->i_transp == tp);
        ASSERT(ip->i_itemp != NULL);
        ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));

        tp->t_flags |= XFS_TRANS_DIRTY;
        ip->i_itemp->ili_item.li_desc->lid_flags |= XFS_LID_DIRTY;

        /*
         * Always OR in the bits from the ili_last_fields field.
         * This is to coordinate with the xfs_iflush() and xfs_iflush_done()
         * routines in the eventual clearing of the ilf_fields bits.
         * See the big comment in xfs_iflush() for an explanation of
         * this coordination mechanism.
         */
        flags |= ip->i_itemp->ili_last_fields;
        ip->i_itemp->ili_format.ilf_fields |= flags;
}

#ifdef XFS_TRANS_DEBUG
/*
 * Keep track of the state of the inode btree root to make sure we
 * log it properly.
 */
STATIC void
xfs_trans_inode_broot_debug(
        xfs_inode_t     *ip)
{
        xfs_inode_log_item_t    *iip;

        ASSERT(ip->i_itemp != NULL);
        iip = ip->i_itemp;
        if (iip->ili_root_size != 0) {
                ASSERT(iip->ili_orig_root != NULL);
                kmem_free(iip->ili_orig_root);
                iip->ili_root_size = 0;
                iip->ili_orig_root = NULL;
        }
        if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
                ASSERT((ip->i_df.if_broot != NULL) &&
                       (ip->i_df.if_broot_bytes > 0));
                iip->ili_root_size = ip->i_df.if_broot_bytes;
                iip->ili_orig_root =
                        (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP);
                memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot),
                      iip->ili_root_size);
        }
}
#endif